Contention free inter-cellular slot reservation

Self-organising interference coordination in optical wireless networks

“…Such collision can potentially cause high outage particularly at the cell-edge. To mitigate such problem, the cellular slot access and reservation (CESAR) approach [21] is used, which ensures that an idle chunk is not assigned simultaneously by neighbouring APs through a cyclic shifted allocation pattern for idle chunks.…”

“…The contention problem can be mitigated by exploiting the properties of a cellular network using CESAR approach proposed in our earlier study [21]. In summary, the available chunks within the system bandwidth are grouped into R different subbands.…”

“…For the optical network, a reasonable choice of the group size is R = 3. At time instant n, the APs b that belong to group g β [κ, n] ∈ G may access idle chunk (, n) in a predefined cyclic manner, determined by [21] …”

“…CESAR [21] and BB protocol for interference coordination in optical wireless network perfectly complement each other; the former mitigates collisions due to simultaneous access in contention through (14), while the latter facilitates interference aware selection of chunks reserved by transmitting the BB signal.…”

“…Figure 3 Collision avoidance using cellular slot access and reservation (CESAR) approach [21]. The size of the coordination cluster (a) is set such that any two transmitter and receiver pair that could cause collisions are within the coordination cluster, which is a principle followed for resource partitioning (b).…”